// JavaScript Document
jQuery
    .extend({

        createUploadIframe : function(id, uri) {
            // create frame
            var frameId = 'jUploadFrame' + id;

            if (window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId
                    + '" name="' + frameId + '" />');
                if (typeof uri == 'boolean') {
                    io.src = 'javascript:false';
                } else if (typeof uri == 'string') {
                    io.src = uri;
                }
            } else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io;
        },
        handleError : function(s, xhr, status, e) {
            // If a local callback was specified, fire it
            if (s.error) {
                s.error.call(s.context || s, xhr, status, e);
            }

            // Fire the global callback
            if (s.global) {
                (s.context ? jQuery(s.context) : jQuery.event).trigger(
                    "ajaxError", [ xhr, s, e ]);
            }
        },
        httpData : function(xhr, type, s) {
            var ct = xhr.getResponseHeader("content-type"), xml = type == "xml"
                || !type && ct && ct.indexOf("xml") >= 0, data = xml ? xhr.responseXML
                : xhr.responseText;
            if (xml && data.documentElement.tagName == "parsererror")
                throw "parsererror";
            if (s && s.dataFilter)
                data = s.dataFilter(data, type);
            if (typeof data === "string") {
                if (type == "script")
                    jQuery.globalEval(data);
                if (type == "json")
                    data = window["eval"]("(" + data + ")");
            }
            return data;
        },
        createUploadForm : function(id, fileElementId,data) {
            // create form
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = jQuery('<form  action="" method="POST" name="'
                + formId + '" id="' + formId
                + '" enctype="multipart/form-data"></form>');
            if(data){
                for(var i in data){
                    $('<input type="hidden" name="'+i+'" value="'+data[i]+'"/>').appendTo(form);
                }
            }
            var oldElement = jQuery('#' + fileElementId);
            var newElement = jQuery(oldElement).clone();
            jQuery(oldElement).attr('id', fileId);
            jQuery(oldElement).before(newElement);
            jQuery(oldElement).appendTo(form);
            // set attributes
            jQuery(form).css('position', 'absolute');
            jQuery(form).css('top', '-1200px');
            jQuery(form).css('left', '-1200px');
            jQuery(form).appendTo('body');
            return form;
        },

        ajaxFileUpload : function(s) {
            // TODO introduce global settings, allowing the client to modify
            // them
            // for all requests, not only timeout
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = s.fileElementId;
            var form = jQuery.createUploadForm(id, s.fileElementId,s.data);
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;

            if (s.global && !jQuery.active++) {
                // Watch for a new set of requests
                jQuery.event.trigger("ajaxStart");
            }
            var requestDone = false;
            // Create the request object
            var xml = {};
            if (s.global) {
                jQuery.event.trigger("ajaxSend", [ xml, s ]);
            }

            var uploadCallback = function(isTimeout) {
                // Wait for a response to come back
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML
                            : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
                            : io.contentWindow.document;

                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML
                            : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
                            : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success"
                            : "error";
                        // Make sure that the request was successful or
                        // notmodified
                        if (status != "error") {
                            // process the data (runs the xml through
                            // httpData
                            // regardless of callback)
                            var data = jQuery.uploadHttpData(xml,
                                s.dataType);
                            if (s.success) {
                                // ifa local callback was specified, fire it
                                // and pass it the data
                                s.success(data, status);
                            }
                            ;
                            if (s.global) {
                                // Fire the global callback
                                jQuery.event.trigger("ajaxSuccess", [ xml,
                                    s ]);
                            }
                            ;
                        } else {
                            jQuery.handleError(s, xml, status);
                        }

                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }
                    ;
                    if (s.global) {
                        // The request was completed
                        jQuery.event.trigger("ajaxComplete", [ xml, s ]);
                    }
                    ;

                    // Handle the global AJAX counter
                    if (s.global && !--jQuery.active) {
                        jQuery.event.trigger("ajaxStop");
                    }
                    ;
                    if (s.complete) {
                        s.complete(xml, status);
                    }
                    ;

                    jQuery(io).unbind();

                    setTimeout(function() {
                        try {
                            jQuery(io).remove();
                            jQuery(form).remove();

                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }

                    }, 100);

                    xml = null;

                }
                ;
            }
            // Timeout checker
            if (s.timeout > 0) {
                setTimeout(function() {

                    if (!requestDone) {
                        // Check to see ifthe request is still happening
                        uploadCallback("timeout");
                    }

                }, s.timeout);
            }
            try {
                var form = jQuery('#' + formId);
                jQuery(form).attr('action', s.url);
                jQuery(form).attr('method', 'POST');
                jQuery(form).attr('target', frameId);
                if (form.encoding) {
                    form.encoding = 'multipart/form-data';
                } else {
                    form.enctype = 'multipart/form-data';
                }
                jQuery(form).submit();

            } catch (e) {
                jQuery.handleError(s, xml, null, e);
            }
            if (window.attachEvent) {
                document.getElementById(frameId).attachEvent('onload',
                    uploadCallback);
            } else {
                document.getElementById(frameId).addEventListener('load',
                    uploadCallback, false);
            }
            return {
                abort : function() {
                }
            };

        },

        uploadHttpData : function(r, type) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // ifthe type is "script", eval it in global context
            if (type == "script") {
                jQuery.globalEval(data);
            }

            // Get the JavaScript object, ifJSON is used.
            if (type == "json") {
                //eval("data = " + data);
                data = jQuery.parseJSON(jQuery(data).text());
            }

            // evaluate scripts within html
            if (type == "html") {
                jQuery("<div>").html(data).evalScripts();
            }

            return data;
        }
    });
